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Technical interview
React.js
When facing a list of 10,000 complex elements that severely slows down the app, what's your step-by-step optimization strategy?
I start by profiling with React DevTools to identify unnecessary re-renders. Then I implement DOM virtualization with react-window. Finally, I memoize heavy components with React.memo and use useMemo for expensive computations.
Great point on virtualization. How do you avoid cascading re-renders if this list depends on a frequently changing global Context?
I use selectors with Zustand or Redux so each component only subscribes to the strict portion of state it needs. If I stick with Context, I split it into specialized contexts to isolate re-renders.
AI Analysis
92/100
Overall scoreSummary
Excellent technical demonstration. The candidate precisely identifies bottlenecks, masters advanced tooling, and justifies architectural choices with precision.
Systemic masteryBest practicesPragmatism
Detailed evaluation
Depth of expertise95
Architecture & design90
Communication88
Problem solving92
Recommendation
Strong recommendation. Profile perfectly aligned with Senior expectations. Final interview can focus on cultural fit and leadership.